/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.activiti.engine.impl.cmd;

import java.io.Serializable;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.JobEntity;
import org.flowable.job.api.Job;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Saeid Mirzaei
 * @author Joram Barrez
 */

public class DeleteJobCmd implements Command<Object>, Serializable {

    private static final Logger LOGGER = LoggerFactory.getLogger(DeleteJobCmd.class);
    private static final long serialVersionUID = 1L;

    protected String jobId;

    public DeleteJobCmd(String jobId) {
        this.jobId = jobId;
    }

    @Override
    public Object execute(CommandContext commandContext) {
        JobEntity jobToDelete = getJobToDelete(commandContext);

        jobToDelete.delete();
        return null;
    }

    protected JobEntity getJobToDelete(CommandContext commandContext) {
        if (jobId == null) {
            throw new ActivitiIllegalArgumentException("jobId is null");
        }
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("Deleting job {}", jobId);
        }

        JobEntity job = commandContext.getJobEntityManager().findJobById(jobId);
        if (job == null) {
            throw new ActivitiObjectNotFoundException("No job found with id '" + jobId + "'", Job.class);
        }

        // We need to check if the job was locked, ie acquired by the job acquisition thread
        // This happens if the job was already acquired, but not yet executed.
        // In that case, we can't allow to delete the job.
        if (job.getLockOwner() != null) {
            throw new ActivitiException("Cannot delete job when the job is being executed. Try again later.");
        }
        return job;
    }

}
